A clamp has been sewn in at the back, which can be used to mount the bag on a suitcase. This will make it easy to move around with both a suitcase and a bag. Keep calm and don't worry about possible costs for imprecise size of hand luggage.
Carry-On Cabin Bag Backpack 40x25x20 Aircraft Hand Luggage Grey
5 Cities Ryanair Max (40x20x25cm) New and Improved 2024 Backpack
CarryOn Cabin Bag Backpack 40x30x20 Aircraft Hand Luggage Leaves
5 Cities Ryanair Max (40x20x25cm) New and Improved 2024 Backpack
Best mini cabin luggage 2024: Bags that fit under airline chairs
Easyjet Cabin Bag 45x36x20 Backpack, 40x20x25 Ryanair Carry-Ons
5-Cities Ryanair Maximum (40x20x25cm) New and Improved 2024
5-Cities Ryanair Maximum (40x20x25cm) New and Improved 2024
Carry-On Cabin Bag Backpack 40x25x20 Aircraft Hand Luggage Grey
5-Cities Ryanair Maximum (40x20x25cm) New and Improved 2024
CarryOn Cabin Bag Backpack 40x30x20 Aircraft Hand Luggage Leaves